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P r e p a r e y o u r M i c r o s o f t ® W i n d o w s c l i e n t m a c h i n e s

Each client machine that runs the migration utility needs to have the following minimum configuration:

  • Microsoft® Windows: Windows XP SP3, Windows Vista Business SP1 or later, Windows

7, Windows Server 2003 SP 2 or later


We have seen increased performance in terms of the number of simultaneous threads you can run with Microsoft® Windows Server 2003 and up. Current testing indicates that 25 simultaneous threads is an optimal number with this configuration.

F o r a l l v e r s i o n s , u s e t h e l a t e s t p a t c h e s f o r y o u r v e r s i o n o f M i c r o s o f t ® W i n d o w s .

Microsoft Outlook® 2003 or 2007 (required only if you are migrating from Microsoft® Exchange Server or PST files). Be sure to upgrade to the latest service packs and patches for Outlook, especially if you see any 0x80040900 or Missing Property errors.

  • Memory: 512 RAM

  • CPU: 2 GHz +

  • Minimum Disk Space: 8 GB of Disk Space

  • Accurate time: In order for 2-Legged OAuth to function properly, make sure the time on

each client machine is set accurately to the current time for the local time zone.

Keep in mind that the migration process is multi-threaded, which can consume a lot of resources, and that data for each user being processed is loaded into memory. Given that, we recommend that you opt for dedicated machines with more robust CPU and memory, increasing the resources with the number of users you plan to process simultaneously on each machine.

Note: To avoid authentication issues with Exchange Server, we recommend that you log in to the client machines with your Exchange Server administrator credentials.

Migrate your shared contacts to Google Apps

Before you migrate your users, you should migrate your shared contacts to Google Apps so that your users have immediate access to your full address list as soon as they’re migrated.

For information about migrating contacts, see the following books for suggested options:

  • Google Apps for Business Technical Transition Guide

  • Google Apps Directory Sync Administration Guide

Preparing for Your Migration


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